Ok. you have a large number of explanations.
1) A draft of air.
2) Perhaps a small force happened in the circuitry.( Such as a relay switching).
3) An invisible man was in your room
4) Ghosts.
Let's just think this through, it was near a window where you would expect a large amount of air would travel through if there was a draft.
I think the chances are that there was probably a small draft that moved this alarm clock.
i dont think a small draft can do that, i heard it slide across abit and then drop , windows are closed to and there double glazzing, so there is no draft ...
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